"The FAA's return-to-service decision for the MAX will rest solely on the FAA's assessment of weather Boeing's proposed software updates and pilot training address the know issues for the grounding of the aircraft."
Is it a known issue that it appears Ethiopian flight ET 302 could not move the manual trim wheel after MCAS activation?
Why did the crew reengage the cut out switches? - that's right, this info was only known after the grounding!